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The Denying Dutchman


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PostPosted: Sat Apr 28, 2012 10:21 pm    Post subject: Reply with quote
I created a monster!  



The last 20 seconds or so the engine really got the hang of it, on video the sounds doesn't seem harder, but it actually woke up my wife who was already asleep. I think I'll rename my boat "Satan".  



I had to add weight to keep the tubes under water, but that wouldn't slow it down.
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Les


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PostPosted: Sat Apr 28, 2012 10:25 pm    Post subject: Reply with quote
That's wonderful, it sounds like a machine gun.    
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mogogear


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PostPosted: Sat Apr 28, 2012 10:29 pm    Post subject: Reply with quote
Shooting  Shooting  Shooting  Shooting  Shooting  Shooting  Shooting  Shooting  Shooting  Shooting  Shooting  Shooting

at least that is what your wife thought!!

   


That thing really fires...In the same class as Daryl's for real performance I would say --


Paul the soldering job really delivers the speed----out on a open pond it would MOVE

   
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Mo (greg)

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The Denying Dutchman


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PostPosted: Sat Apr 28, 2012 11:04 pm    Post subject: Reply with quote
It indeed sounds like a machine gun.  

I don't know why it does that, the output is quite constant. Maybe it has something to do with the design of the boiler.



This is how the boiler looks like. It consist of 3 plates, the lower plate which forms the boiler (blue), a 2nd plate (black) which has a rounded shape smaller than the size of the boiler and on top of that the 3th plate (red) which is the membrane. The membrane is soldered only to the edges so it can expand over a large area, the area during the vacuum fase of the engine is restricted by the 2nd plate.
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Gary279


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PostPosted: Sat Apr 28, 2012 11:11 pm    Post subject: Reply with quote
Awesome Paul!!!  She sounds like a Maxim machine gun!!
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Gary279


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PostPosted: Sun Apr 29, 2012 12:37 am    Post subject: Reply with quote
The Denying Dutchman wrote:

One thing I don't understand is why you have two vertical pipes. You want to push the boat forward, not up.


I have curved extension pipes I put on to test it...
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ozsteamdemon


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PostPosted: Sun Apr 29, 2012 1:05 am    Post subject: Reply with quote
Great work Paul , glad to see you bounce back with a fine little boat .  
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mogogear


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PostPosted: Sun Apr 29, 2012 1:12 am    Post subject: Reply with quote
Gary279 wrote:
Awesome Paul!!!  She sounds like a Maxim machine gun!!



But immensely more reliable  
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The Denying Dutchman


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PostPosted: Sun Apr 29, 2012 1:25 am    Post subject: Reply with quote
Here's the link to my other Putt-putt boat:

http://modelsteam.myfreeforum.org/ftopic50493-0-0-asc-.php
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MrDuck


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PostPosted: Sun Apr 29, 2012 5:06 am    Post subject: Reply with quote
You need some bigger water to run her in
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Wallace


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PostPosted: Sun Apr 29, 2012 6:27 am    Post subject: Reply with quote
I'm really enjoying this thread. All wonderful entries  
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Sandman


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PostPosted: Sun Apr 29, 2012 8:18 am    Post subject: Reply with quote
Wallace wrote:
I'm really enjoying this thread. All wonderful entries  


I agree mate. This is just mesmerising stuff.      
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Swift Fox


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PostPosted: Sun Apr 29, 2012 10:20 am    Post subject: Reply with quote
That sounds fantastic Paul and i think the square tubes work well as it seems to go at a fair pace.
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The Denying Dutchman


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PostPosted: Sun Apr 29, 2012 10:46 am    Post subject: Reply with quote
Gary279 wrote:
The Denying Dutchman wrote:

One thing I don't understand is why you have two vertical pipes. You want to push the boat forward, not up.


I have curved extension pipes I put on to test it...


Are you sure there isn't any leaks between the pipes and the extensions? Best is to solder them permanently so that heat is transfered over the lenght of the pipes. You want a hot boiler and cool pipes. (If pipes get too hot the oscillating proces takes place in the pipes instead of the boiler, making the boiler hotter and thereby making the pipes also hotter. This proces will continue untill the boiler fails because of overheating or the engine will just stall.)
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The Denying Dutchman


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PostPosted: Sun Apr 29, 2012 10:48 am    Post subject: Reply with quote
MrDuck wrote:
You need some bigger water to run her in


My wife won't let my build a permanent Putt-Putt pool in the garden like Daryl has.  
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